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I have a 97 Z3 2.8. Have s slight knocking/thumping coming from the rear-end of the car. Most noticable when the car is cold and/or driving slowly. Went to local garage for BMW and they said it was the tires coming apart (62,000 miles on the tires). Got new tires but the noise is still there, slightly louder. Car has 119,000 miles. Have had all regular maintenance done on it. Could this be transmission? Something else? Any suggestions?